An insulated rigid tank of volume 8 m3 initially contains air at 600 kPa and 400 K. A valve connected to the tank is opened, and air escapes until the pressure inside the tank is 200 kPa. The air temperature during the release is kept constant using an electrical resistance heater in the tank. What is the amount of work done by the resistance heater (Wcv) during the process

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?

Manometers are good examples of measuring instruments, nowadays they are not as common as before. a)-capacitive probe gauges b)-gravitational gauges deformation ) gauges d)-digital gauges